Am I right in thinking you get £5 discount per race entered if BTF affiliated? If so, it would make sense to enter at least 8 Tri's. Can you claim the discount retrospectively on events already entered?

Schmunks - you'll get the £5 discount either when you enter (you have to put your BTF number on the entry as proof of membership) OR as Meldy says, when you register and they hand you a crisp £5 note. most do the discount at entry time.

but there are other benefits such as training insurance if you get injured

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